Journal
PHYSICAL REVIEW B
Volume 80, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.075304
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Funding
- Japan Society for the Promotion of Science [19310067]
- Grants-in-Aid for Scientific Research [19310067] Funding Source: KAKEN
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We report on the dynamic optical properties of excitons in moving dots (dynamic quantum dots, DQDs) formed by the interference of orthogonally propagating surface acoustic waves (SAWs) in GaAs/AlAs quantum wells. Spatially and time-resolved photoluminescence (PL) measurements using a synchronized excitation method clearly demonstrate the formation of two interpenetrating square arrays of DQDs, one consisting of potential dynamic dots (p-DDs) formed by the SAW piezoelectric potential and the other consisting of strain dynamic dots created by the strain-induced band-gap modulation. We found that the p-DDs induce a PL-polarization anisotropy, leading to a checkered spatial modulation pattern for the preferential PL-polarization direction. Carrier dynamics under SAW fields, which affect the effective diffusion length of excitons and the PL quenching time, is invoked to clarify the physical mechanisms underlying the PL-mapping spectra obtained by the synchronized excitation method. A theoretical analysis on the band structures and optical transition properties modified by SAWs consistently explains the experimental results.
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